Fix import_mappings glob argument in load.sh

* The mappings live in redirector/data/mappings, not redirector/mappings
* They're CSVs, not TSVs
Merge pull request #4 from alphagov/fix-mappings-load-sh

Fix import_mappings glob argument in load.sh
Merge branch 'master' into destiny_buttons
Provide mapping for manual URL
Merge branch 'origin/destiny_buttons'

Conflicts:
	app/models/url.rb